diff options
| author |   Shannon Zhao <shannon.zhao@linaro.org> | 2016-04-07 20:03:29 +0800 |
|---|---|---|
| committer |   Will Deacon <will.deacon@arm.com> | 2016-04-25 13:53:45 +0100 |
| commit | 2366c7fdb59812bbd1382afed69e250582c64187 (patch) | |
| tree | 4700d4de6ed8dab12ba4e23adaaf88eddca60d29 | |
| parent | arm64: ptdump: add region marker for kasan shadow region (diff) | |
| download | linux-dev-2366c7fdb59812bbd1382afed69e250582c64187.tar.xz linux-dev-2366c7fdb59812bbd1382afed69e250582c64187.zip | |
ARM64: ACPI: Check if it runs on Xen to enable or disable ACPI
When it's a Xen domain0 booting with ACPI, it will supply a /chosen and
a /hypervisor node in DT. So check if it needs to enable ACPI.
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Julien Grall <julien.grall@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
| -rw-r--r-- | arch/arm64/kernel/acpi.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c index d1ce8e2f98b9..57ee31745af5 100644 --- a/arch/arm64/kernel/acpi.c +++ b/arch/arm64/kernel/acpi.c @@ -67,10 +67,15 @@ static int __init dt_scan_depth1_nodes(unsigned long node, { /* * Return 1 as soon as we encounter a node at depth 1 that is - * not the /chosen node. + * not the /chosen node, or /hypervisor node with compatible + * string "xen,xen". */ - if (depth == 1 && (strcmp(uname, "chosen") != 0)) - return 1; + if (depth == 1 && (strcmp(uname, "chosen") != 0)) { + if (strcmp(uname, "hypervisor") != 0 || + !of_flat_dt_is_compatible(node, "xen,xen")) + return 1; + } + return 0; } @@ -184,7 +189,8 @@ void __init acpi_boot_table_init(void) /* * Enable ACPI instead of device tree unless * - ACPI has been disabled explicitly (acpi=off), or - * - the device tree is not empty (it has more than just a /chosen node) + * - the device tree is not empty (it has more than just a /chosen node, + * and a /hypervisor node when running on Xen) * and ACPI has not been force enabled (acpi=force) */ if (param_acpi_off || |